Effects of chlorpromazine on infection phenotypes. Confluent Cos-7 cell monolayers were infected with KOS (A and B), KgBY889A (C and D), or KgBLL871AA (E and F) or were mock infected (G and H). At 2 h after infection, cells were either treated with 5 μg of chlorpromazine/ml (A, C, E, and G) or left untreated (B, D, F, and H). Cells were observed at 20 h postinfection.